Add dp_id lable in prometheus gauge test labels
Add dp_id lable in prometheus gauge test labels

trentindav/faucet,wackerly/faucet,shivarammysore/faucet,mwutzke/faucet,REANNZ/faucet,trentindav/faucet,byllyfish/faucet,faucetsdn/faucet,anarkiwi/faucet,REANNZ/faucet,Bairdo/faucet,wackerly/faucet,faucetsdn/faucet,mwutzke/faucet,shivarammysore/faucet,byllyfish/faucet,anarkiwi/faucet,Bairdo/faucet,trungdtbk/faucet,trungdtbk/faucet,gizmoguy/faucet,gizmoguy/faucet